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#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_event.h>
#define NGX_NONE 1
ngx_inline static int ngx_output_chain_need_to_copy(ngx_output_chain_ctx_t *ctx,
ngx_hunk_t *hunk);
static int ngx_output_chain_copy_hunk(ngx_hunk_t *dst, ngx_hunk_t *src,
u_int sendfile);
int ngx_output_chain(ngx_output_chain_ctx_t *ctx, ngx_chain_t *in)
{
int rc, last;
size_t size, hsize;
ngx_chain_t *cl, *out, **last_out;
/*
* the short path for the case when the chain ctx->in is empty
* and the incoming chain is empty too or it has the single hunk
* that does not require the copy
*/
if (ctx->in == NULL) {
if (in == NULL) {
return ctx->output_filter(ctx->output_ctx, in);
}
if (in->next == NULL
&& (!ngx_output_chain_need_to_copy(ctx, in->hunk)))
{
return ctx->output_filter(ctx->output_ctx, in);
}
}
/* add the incoming hunk to the chain ctx->in */
if (in) {
if (ngx_chain_add_copy(ctx->pool, &ctx->in, in) == NGX_ERROR) {
return NGX_ERROR;
}
}
last = NGX_NONE;
out = NULL;
last_out = &out;
for ( ;; ) {
while (ctx->in) {
if (!ngx_output_chain_need_to_copy(ctx, ctx->in->hunk)) {
/* move the chain link to the chain out */
cl = ctx->in;
ctx->in = cl->next;
*last_out = cl;
last_out = &cl->next;
cl->next = NULL;
continue;
}
if (ctx->hunk == NULL) {
/* get the free hunk */
if (ctx->free) {
ctx->hunk = ctx->free->hunk;
ctx->free = ctx->free->next;
} else if (ctx->hunks < ctx->bufs.num) {
size = ctx->bufs.size;
if (ctx->in->hunk->type & NGX_HUNK_LAST) {
hsize = ngx_hunk_size(ctx->in->hunk);
if (hsize < ctx->bufs.size) {
/*
* allocate small temp hunk for the small last hunk
* or its small last part
*/
size = hsize;
} else if (ctx->bufs.num == 1
&& (hsize < ctx->bufs.size
+ (ctx->bufs.size >> 2)))
{
/*
* allocate a temp hunk that equals
* to the last hunk if the last hunk size is lesser
* than 1.25 of bufs.size and a temp hunk is single
*/
size = hsize;
}
}
ngx_test_null(ctx->hunk,
ngx_create_temp_hunk(ctx->pool, size),
NGX_ERROR);
ctx->hunk->tag = ctx->tag;
ctx->hunk->type |= NGX_HUNK_RECYCLED;
ctx->hunks++;
} else {
break;
}
}
rc = ngx_output_chain_copy_hunk(ctx->hunk, ctx->in->hunk,
ctx->sendfile);
if (rc == NGX_ERROR) {
return rc;
}
if (rc == NGX_AGAIN) {
if (out) {
break;
}
return rc;
}
/* delete the completed hunk from the chain ctx->in */
if (ngx_hunk_size(ctx->in->hunk) == 0) {
ctx->in = ctx->in->next;
}
ngx_alloc_link_and_set_hunk(cl, ctx->hunk, ctx->pool, NGX_ERROR);
*last_out = cl;
last_out = &cl->next;
ctx->hunk = NULL;
if (ctx->free == NULL) {
break;
}
}
if (out == NULL && last != NGX_NONE) {
return last;
}
last = ctx->output_filter(ctx->output_ctx, out);
ngx_chain_update_chains(&ctx->free, &ctx->busy, &out, ctx->tag);
last_out = &out;
}
}
ngx_inline static int ngx_output_chain_need_to_copy(ngx_output_chain_ctx_t *ctx,
ngx_hunk_t *hunk)
{
if (ngx_hunk_special(hunk)) {
return 0;
}
if (!ctx->sendfile) {
if (!(hunk->type & NGX_HUNK_IN_MEMORY)) {
return 1;
}
hunk->type &= ~NGX_HUNK_FILE;
}
if (ctx->need_in_memory && (!(hunk->type & NGX_HUNK_IN_MEMORY))) {
return 1;
}
if (ctx->need_in_temp && (hunk->type & (NGX_HUNK_MEMORY|NGX_HUNK_MMAP))) {
return 1;
}
return 0;
}
static int ngx_output_chain_copy_hunk(ngx_hunk_t *dst, ngx_hunk_t *src,
u_int sendfile)
{
size_t size;
ssize_t n;
size = ngx_hunk_size(src);
if (size > (size_t) (dst->end - dst->pos)) {
size = dst->end - dst->pos;
}
if (src->type & NGX_HUNK_IN_MEMORY) {
ngx_memcpy(dst->pos, src->pos, size);
src->pos += size;
dst->last += size;
if (src->type & NGX_HUNK_FILE) {
src->file_pos += size;
}
if ((src->type & NGX_HUNK_LAST) && src->pos == src->last) {
dst->type |= NGX_HUNK_LAST;
}
} else {
n = ngx_read_file(src->file, dst->pos, size, src->file_pos);
if (n == 0) {
ngx_log_debug(src->file->log, "READ: %qd:%qd %X:%X %X:%X" _
src->file_pos _ src->file_last _
dst->pos _ dst->last _ dst->start _ dst->end);
}
if (n == NGX_ERROR) {
return n;
}
#if (NGX_FILE_AIO_READ)
if (n == NGX_AGAIN) {
return n;
}
#endif
if ((size_t) n != size) {
ngx_log_error(NGX_LOG_ALERT, src->file->log, 0,
ngx_read_file_n " reads only %d of %d from file",
n, size);
if (n == 0) {
return NGX_ERROR;
}
}
src->file_pos += n;
dst->last += n;
if (!sendfile) {
dst->type &= ~NGX_HUNK_FILE;
}
if ((src->type & NGX_HUNK_LAST) && src->file_pos == src->file_last) {
dst->type |= NGX_HUNK_LAST;
}
}
return NGX_OK;
}
int ngx_chain_writer(void *data, ngx_chain_t *in)
{
ngx_chain_writer_ctx_t *ctx = data;
ngx_chain_t *cl;
for (/* void */; in; in = in->next) {
ngx_alloc_link_and_set_hunk(cl, in->hunk, ctx->pool, NGX_ERROR);
*ctx->last = cl;
ctx->last = &cl->next;
}
ctx->out = ngx_write_chain(ctx->connection, ctx->out);
if (ctx->out == NGX_CHAIN_ERROR) {
return NGX_ERROR;
}
if (ctx->out == NULL) {
ctx->last = &ctx->out;
return NGX_OK;
}
return NGX_AGAIN;
}
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